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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bbf53b006a95c156f1944fafabfadd0d1811f96285a283194194343e9c0414' 
  AND token = 'iSfa641aihJBwFXPQ5OQ8FVGR1c0B4VK7MMo739qSIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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