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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd812bfb175859039cf89cb4ff74c763c793ac146f0b7b6993a5d48be3b94708d' 
  AND token = '+1tY5WxB9WIBgSgE4ukDjVo4LmWsJLpWEQATxpKrpTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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