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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed86e79df6eb1bd0673e242e2f1c4651345043b6a90b808846eb5196b34211a' 
  AND token = 'w5TpFmZ1sDQ8NGpeGoI2qCJGyPdZAYfbqwJfh8XISHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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