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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8965628bcc769260a1652db64b4567f275b78b8d8d10c383a0ee2da3a26eed7a' 
  AND token = '+AnLllCWdq9CrwA0X7BwI9XXygDYXd/dj6EYNsMRrxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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