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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f400e7debb6f56b604d5790c5b5c1bf1c39dff5cf971fc7e84718dfac01fe589' 
  AND token = '47mzF7nIVz/TXMdbGHdlKBivarXfDkZmopJATbz9yZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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