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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89929d9058ec5dddeb6a6facfd46a67e9f73ec48cb7819c120c0e54e34c2df1' 
  AND token = 'o7AcMeS89ypdzdtGFm9XVrZe/WA6hJP6gp/mF03jXTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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