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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38387a90ee9ea5664db7bf1509e2b83820d44436b0e8bff6a64219e65f6e94f4' 
  AND token = 'mYQ4s5LogUrnBFDRqGSdpBqAzM2Ig7KfIZo+6Ec2GRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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