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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf4121e8451a2ff8d684df42701e3a7a1181383218869ddae93105221f62852' 
  AND token = 'Hq7Mxw8QjGnJCZ78+9Y+mzjDIQyu07+Bod0UA4ns22I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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