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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c84da7a57ac88b0c5c69da053b371822436aed984301e41dda26bbc322fe944' 
  AND token = 'Aj4XPC1eqJ3t6GdbEElTeTbpxepdvMSsK6nQ4aP5pl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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