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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e952ddb9f10a0f71c599e8287fedb38344ad0f523501704d8de691e6aa39aa33' 
  AND token = 'dNVKnG8ATY0hyk060z11lfoWhzHaxHmyl1wns7+WErI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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