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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd558993f3806140bf10eceb32f5bc40ea7ec29f69026156ac4df5987b3c92fff' 
  AND token = 'NYF6UxkpM4KLD1lM69J07/Jmzf1WhVUUu7I1PNTPRzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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