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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea3037c6df30cf0f296ca2568c4c14111f8cfb1b59ed01af63e794a21fe9cde' 
  AND token = '9gmncPO+kh/0hxGbqsScdyKCfa2cK9PLeM2cjDi21wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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