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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516a591644a07a2de2209c4c1744ab6f0f1b6ce6b6395cc304cc82939cb5013b' 
  AND token = 'DMZZYnxf5MzsU14uzKAO8foIGxAyfgX55APN0F9Lurc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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