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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80437e583407463b12e4716c030a571ac1283eeeea2bcde6214ee433588399e' 
  AND token = 'KkMPh2UmVx2QtKGXA1rtset8vV5hG3v5HC8VuYj9Hww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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