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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2dcbaa3c8c93ef4d108fb8de31b9f707f861b461d6413fc0669b2cbcea6ab4' 
  AND token = 'ln+B61nenMjqOsCZoIb+GnF5/byYTHOBi/k2pvXFBWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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