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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4720c1ad59cdab5558463adc9d11d02dca7632a559013a352707143c4a204f72' 
  AND token = '0gMSrojeeroYiVzSHxxGfGQDde9SvX0dFXIcXo067Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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