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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be1fb7b5511b773867f84dfe086910361a6e828b6d5a05eee39001725f516e6' 
  AND token = 'U8RywUEKTDxt37vAhteZoQ6jtWPchxlHaPdugj+Y1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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