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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5689f9e5a4e428cc6e21a4c647ccabaf307437de86d342206f929eb55e5cb5bd' 
  AND token = 's7f7VTEgQKYh24UwXcZnrZjuv5W8hTEYknyb9TckQNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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