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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8290dfcbc4d1e9c0f41a5cc5d3d049a9e9d2363c27eeea580bbccf6d254ef713' 
  AND token = 'An/SM7vmJpWnR0UCPLzROmGkOq0Ou8ZoeQci9y3gm4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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