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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fe215b64892482a107db4f29194e1a8e76b9c7953296b1f2a001ba08477bc8' 
  AND token = 'q/loLiPlmYIqz0xbJ41mf5cvH/izKR8yAUAdGE5916c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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