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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4084409ab8893c212b87f502a153b83a348f68b165651088b2c8721e98af4e7' 
  AND token = 'UGTOWAFQoESaBB5HUk+XuidXDqkZEqRUMK2iQVKrd38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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