SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd928e4cbd313d24e376a2dd84f20f2fa99b8939ff73f698141fcb33995b71b75' 
  AND token = 'YqcGjp+tJD4/L1MZFAvBIfRvD+aaaHC9ivGK3TemiEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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