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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6328d5f391b58b8c5d2f73d29dda3d9e8f873e139ed7cfb1b91f6721fdb7d80e' 
  AND token = 'TlFkrKvhb64xt+0USjMYefps+0LFAdwxEpzHBSEY/eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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