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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cbbfcf76f3eb0e7dcd8618aafb3ef12b616347085d54327892941e3761f879' 
  AND token = 'YEKINgHa+u9wN51cCuP8VuTEavFQVv6F7Y4gi0OEWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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