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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62f6c7eb7fbb3ecf3a6b971651aea84fe75ea9e33646bb733529b5904312ee2' 
  AND token = 'Xq779rAvNJix4Zmyx1QB0Z/P7y7zc1qzXFvTezkjKyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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