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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10a9d040e94bbf8b7514f64d7dd345ead2c0e40733d7de5c8a22f647c039802' 
  AND token = 'UHllr4sAtSQkNfGDaR6P68Ksnbsqcxc7HnJlV6/8nMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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