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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110f2bf527b28bca99b5197ce79d1084aaa7e77b6b3999d99e11f45b0db11e28' 
  AND token = 'xulWOliECqhWzOO48uU13AolwaJ00xnRdi3UmoxjzIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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