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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8ca0309cb67ca1df95f98c6e3f57c898ca3365a49a879b7c0d2d5cfbb61b91' 
  AND token = 'du7e1lQMFYikehkGXx/6e1/T8YhPRTgV9hDUmnPZCzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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