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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5cb6266c0c657ed266d36c74d1789764ec440989e0e21a04750c4574f4ce99' 
  AND token = 'k9BZiTsa8lOaYINOiTGgeppl1tGkGI3/spArhFSdq6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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