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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456bbccb56b089e10e70f1a8e900a0b576eebb8329d46bbd11dd2e7c0672353a' 
  AND token = 'pPNJipA7Uus/SusEaPiIcqTSOo5z7uRNCOSV8f3BUC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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