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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4790db0a33f0c95f388ed126bd33ce2c88694a9c0d1607cad17425f9ea892297' 
  AND token = 'dYL7YifsERLeVyZ9QXKqJEjqpOdi29MAzPg/syqrw9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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