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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73929f7c8ad0c78f7ee96b0e74475bd600a1eb01e5c16f470432fc611b920687' 
  AND token = 'JqEfLZz1gvZbWoyOWHGAfqABrkHQdBPDXaP0OZ0j8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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