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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd245f37dcbff4d23a0228a30bb782d849f0c0ef00635920fe03787fb09cdeb63' 
  AND token = '0QE1c7l6IFlLlYXA3DlWIDKIxy8GIw98YwdM3KwLbno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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