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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc40d8848ca6fb39fdeac6b52f5d804f9732eb1a8b5c2bd740683beaf4a50f4' 
  AND token = '4I8DuSZPlQr21z47PE1RP1n0JBs2sdmZlWlFuuZMq4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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