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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba546b4d41ab869c41cfcc48c409a030bead49d252db18f8a94f55b915aee55f' 
  AND token = 'JiwHgSBm+mh03yQQVYsLrxkcHB00D3ir+VaPshFtGbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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