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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28d248fe8e88b247ef3c051c6b9ac8a8404258081b0038d5e5bff7b4d2439c9' 
  AND token = 'DvapZel8LUpJYQGbl0pcKbM7m0Y30VbOhTABISUP8sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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