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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfa6a9e5ec28fe636395cadf420a76ab82322d29fa22a3bb964ab7209ff3433' 
  AND token = 'WGUjsYpbrYyFGNYUz61nTvTD3Wu/mgP1tBVSE8XiT4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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