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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06369815833f5ced5e93b76b1aef0eb38ca4eb2afd72449cb1995366eb3efba' 
  AND token = '3bHCoHnDJpeAl6GiiEChekj/9R/Sw1Gn13/Z0RIiDwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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