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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35756dc05d64dec54c478139790e6263426fe68f6b8f4f926777557c330ad786' 
  AND token = 'i3utaqscpz9zOt4hVuyyNBII8hWJ6vCHD360TtXqFFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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