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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b83285af3bae175b20d0b0eeb99a3eef37e96d3310d4ab4c0af969041c88b4' 
  AND token = 'CwjUfcUTOj/sCg2AWvJ85t5oVrMO4JA94IElwcBsntQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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