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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9933e5979545a0062aaf56451e28bcc5e34ea48add7d44cb1653d00697b08e11' 
  AND token = '8LA+sTRsVeuZbvVek5EI6JaRAoZrbiYymdFErVzdoVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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