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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf673d950a7bc9f2643f9456911b9eec4c04f86520b3e50e0fa299b957ccf5a7' 
  AND token = '3UbGSHXmYmYWNcXSSucZcjVpxSnQ+jh4ZLL6UfiS2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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