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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39747989d332977e2751ad90e6f1f74f7cd7aff7fadaaba5151496d19fe27749' 
  AND token = 'HD06oVAqK/Myij5O7EWpjtahuq3bEeU9er6FaxfLoWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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