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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c04b30154274e55b76f637efa0b1a1b3cb1b06bcd6dffa84fa96934c732d82e' 
  AND token = 'HYQvxyyUPCS0vHt82HTW8/55HttpOxxAEGJRM+/XWgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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