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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e330c9aab2b5de04019e33860c800cd10c9537b6fe709ca91e500cd360533d' 
  AND token = 'cGyEyxxojP8D1iSHYu+Ymh3XLniCURaL/cD/BftX3nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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