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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c85abfbf27ff402e46b201049b783cdf515743db20d1fca473247291a6fe29d' 
  AND token = 'REbgt6jLdUUC8GbKaB1cimAhYmOT1LDpm0GbTJYDc/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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