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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5f04920f583e850180d26207153609d2edbca6eb8f7ef6e31d4cf729f9e6cd' 
  AND token = 'kwwcB9c57M3nLYAPcGzwhSI3bTVN0TnBfaFPu9VbXc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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