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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7b701976e4a76d24c918052d339b9a5cd437f92b44fa248b5202f53e4acad2' 
  AND token = 'ixlvK2SXk1S933IBdhYkXFxRdJ90ET/yZiSNC+JCsK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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