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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1664d232a6b8d7217673d953b571be250a285285232dab0ab24d6b42222fa44f' 
  AND token = 'SAi2RP+Xy0M8Gf9P/w8JlFw64kWAyX5cTNR1pircFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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