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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a053c6929b5a1a4d149898a57cc6b4e92dc4ad9ecaa43aabe18d526e2e548f' 
  AND token = 'D3szx83fGjn0o0K0a2nnfyd0pPR55BfKrnJ1CVk2mT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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