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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105bfa714db7ab99b1788046bc33829db28151fab3c2a5275f3caa07456a00ef' 
  AND token = '30fyvNDHidE7d0xyZICKrDV2g4MtFdW24DbEcGxFp0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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