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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041400ace9b145220f9c63bd4798cba5941cf89e545d2d259d57fcc02d512d6e' 
  AND token = 'i7oc3Ue4rcbHhZ1xt63o4kxCK38DuyBhABawl1y6KTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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