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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c7d2ed1b34e3a471b20ee3111ee860739d86e0be168b64246ad6d522a96223' 
  AND token = 'B6ZcJUF98e1hh0cm4DpU2nKZTdX7Y3DfHA0UQYMo9Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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