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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9788884eae35a79b6ce1cde96db93bd696c7e8fff9330c4d0a5ed81156c10d' 
  AND token = 'xy9vqqBgmb5VeMyga/sx2DKCCB8sK1cIxx6L5/3V4Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00348

JSON explain

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