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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0bdcb5894a9a51bf4667aa125b607f9a21369a1eec23539c93d42cc798c963' 
  AND token = 'TSKT0FtUwZRr87KJalA+B9CMy/8jB+DFY8eLSlcdhIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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