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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08b6d213f90d9911591a922b138326bacd01c7da6c517800a5826c638abf1ad' 
  AND token = 'LxwL6weHHEZC0Ta/oyaFl5/8IJFtJw4QXyVhtRxOvXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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