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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb40feccb81e9409ebc82ce14c4761771c18adaa15f8a98272974649258a7f87' 
  AND token = '/DLJw2KjCOtqay2/sEqRgihZv0RWTt7O5pXmWjci0wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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