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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677fb0bf0f443ffcdf8c8a10b88f3e38eff448e09e8d897cec8de9cbaee5990e' 
  AND token = '1ys54NU4ec4hPLsrAUVjCMMRpSr4OkQj26iO6DxSY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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