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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd9aa85027fc4b03ef1cc9ad681fb078bb0e52b263c6717390d0cc5bf4073d6' 
  AND token = 'FkGWis4acA2uQRG3MctJ618OkqYncIxyjQQlE+upm4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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