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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2586551de2328f10ccd7248651a08d21d041b293cb4dd75d13ac98b0244a09' 
  AND token = 'zCh2oGA9nva6QKLmeJ3AjC9910Sm65sOSrMBmFL5a7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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