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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673692ad92003a1a3480648f254dc9bb1de57c055fd191d9b1aa7312bb71137c' 
  AND token = 'n4dXjrpznp5iCk+4yOjBy1E9LLsPElSI6Zd1cADkNRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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