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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd6915195b8c5bc91f3d360fa5ae87462fd3ff17f38f24616ac7e5246aac31d' 
  AND token = '6KdV3eziWnfGw5gamkl4eLT1o7wx+4xxo6jmAgRnzYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}