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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56d0d41eda03b14cace8ccdd40e6c87869a6991943e7c247f144359f0314e81' 
  AND token = 'QjTEixULg6RMsbMuvLIGnOKvM2Xltro7sysSR2tVbgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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