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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2265b4be56690334bca0f8b08eb14f70079d9b4c93e0e33303d633ba3240fb' 
  AND token = 'op5YhZwPL7Lq+Q0libHVPAvkr7iI6mXH2UiNpJm9/yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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