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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d0fc9537c04fbe7078b6719c56d08c6cfc038b3e6751b8f536a23ff4243641' 
  AND token = '/4Ucm7Nfc5je59crN2h0USMVIPZR+Go2H7qWEF41OeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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