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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d835819373498ba3a3706cb779da263cc1ea83b9d512e3854bc2ed75ae009d8' 
  AND token = 'Yx/ExWH1tOIr0AW3bCwjrXIjFCa5FNnCRebPFuNgrw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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