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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fdb54303e4d49482fbc88d827011c6c599e0efe90bc0854cb75cb262a86cc5' 
  AND token = '+9cUzNFVIXxTJ+oOoAwIp0bLo5KcYYTTwQSd7Jp8/A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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