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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108bc6870041c1c2e3feb2bada7579b5edcf376d1ec14258881c3ad4d048f7a' 
  AND token = 'W+fODn4xPff5xWW+MX5waMPT9dj5W8bbaRIEf0BEjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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