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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321f7b2487f2a8589de0d64b64c61033b0b8db4bd90f8d95e875e7f1a4adbd1d' 
  AND token = '1/5T1ovMtLdPW2gtBJnPI1mlhkCnnFrpr8yd48KbhBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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