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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ed868dab116a41873c525543f60da063f87ba63af061362587961477bb0805' 
  AND token = 'uf2O4BGK8r7UkFM88TfB/OrYtgyI+z+0Gd2bFyPUMJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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