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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627d2eeac203f1f1fb87868d071329740b6a445b823c71a0faf1efbec16d11ab' 
  AND token = 'D03btxPopD3Zumx7bf5OpKicnNio00EpXzQLBWgRQXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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