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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28409e6574209a59ee143d652f6aa36b7aead48407a9117a63e41e564b95dc60' 
  AND token = 'O6PqRXaLz9y0lYXaUG1AWWzoUrk0vsknRBrLMrKQQCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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