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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b04ae36e6e8ca9dec935460a931f8a3e2a7e4f430aba0cf6d48410bc1325db' 
  AND token = 'fvc2YYYhtYVdZ7USRRQ+0I8u/UXVCuHfH4xJMnHArdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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